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A monochromatic gravity wave observed by the Flatland Atmospheric ObservatoryOn 21 December 1991 from approximately 1300 to approximately 1600 UTC a monochromatic wave train with an 8.2-min period was observed by the suite of instruments at the Flatland Atmospheric Observatory (FAO), located in very flat terrain near Champaign-Urbana, Illinois. A 915-MHz radar measured the vertical wind velocity w every 60 s from 0.55 km MSL (0.34 km AGL) to approximately 3 km with 250-m range gates, and a 50-MHz radar measured the oblique wind in four directions, as well as w, every 130 s from 2.75 to approximately 7.25 km with 750-m range gates. A meteorological ground station measured the surface pressure P, wind speed vector u and azimuth alpha, temperature, solar insolation, etc., every 30 s. P was also measured every 120 s by six digital barograph stations within 30 km of Flatland. Using the hodograph of surface vector u and alpha and the impedance relation, we estimated the azimuthal direction of propagation phi to be 45 deg +/- 15 deg clockwise from north, the intrinsic and apparent horizontal phase speeds C(sub i) and C(sub o), respectively, (which are about equal since the direction of propagation is about normal to the mean wind) to be 21 +/- 5 m/s, and the horizontal wavelength lambda to be 10.0 +/- 2.5 km. The peak-to-peak surface horizontal perturbation velocity varied from approximately 2 to 5 m/s from cycle to cycle.
Document ID
19960010329
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Vanzandt, T. E.
(National Oceanic and Atmospheric Administration Boulder, CO., United States)
Chun, Hye-Yeong
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Clark, W. L.
(National Oceanic and Atmospheric Administration Boulder, CO., United States)
Einaudi, F.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Nastrom, G. D.
(Saint Cloud State Coll. MN., United States)
Riddle, A. C.
(National Oceanic and Atmospheric Administration Boulder, CO., United States)
Warnock, J. M.
(National Oceanic and Atmospheric Administration Boulder, CO., United States)
Date Acquired
August 17, 2013
Publication Date
August 20, 1993
Publication Information
Publication: National Central Univ., Solar-Terrestrial Energy Program: Proceedings of the 6th Workshop on Technical and Scientific Aspects of MST Radar
Subject Category
Communications And Radar
Accession Number
96N17495
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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